### Histograms , superimposed with fitted probability density curves

PROC CAPABILITY is a component of SAS/QC (Quality Control). The

features described below are now available in PROC UNIVARIATE (part of base SAS).

# Histograms and comparative histograms. Optionally, these can be

superimposed with fitted probability density curves for various

distributions and kernel density estimates.

# Cumulative distribution function plots (cdf plots). Optionally,

these can be superimposed with specification limits and probability

distribution curves for various distributions.

# Quantile-quantile plots (Q-Q plots), probability plots, and

probability-probability plots (P-P plots). These plots facilitate the

comparison of a data distribution with various theoretical

distributions.

# Goodness-of-fit tests for a variety of distributions including the

normal.

# Statistical intervals (prediction, tolerance, and confidence

intervals) for a normal population.

# The ability to inset summary statistics and capability indices in

plots produced on a graphics device.